Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a089db74dab904e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 05:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8031db4c48d39ed0e51dfa0f9ff23c6f SHA-1: e2d48f98de72502875e8bd115e70a3eb50e78bc7 SHA-256: 2a089db74dab904ef3a0b43bbe3953c2fba1d22b74c7df3cacd72bed250c3677
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, indicative of a link farm designed for phishing or malware distribution. The presence of embedded JavaScript further suggests malicious intent, likely to execute further stages of an attack or redirect the user. ClamAV detection and ML classification strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.themixchange.com/userfiles/files/44619325927.pdf In PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883b742f169---25986816483.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/wugikidabugotak.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/l9uamt7rk4josvjk7gp51f5qka/46463742810.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/nusikapidomebetafag.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210810060120082659jnfl4.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a31f14b066c22641e9566793d9dc946f/80577794969.pdfIn PDF document text
    • http://co-mit.com/uploads/files/femekipavuligabagezuwokaf.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/dnd8umnfun2s0m0v2lttluself/konikixuje.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/6908e04bb270335eceb0c43e827cfca7/bedexave.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/19175057523.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/fb137e39d4737f7b0ac5d7e4be6908a1/24306626002.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf450cf2f2---rozakobaz.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f94a9c87ea5f3001f9d564f95276406/finiguvusana.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d7d439cfb---96485854338.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/radumiwalulubodevewunaki.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c77243096---94133196170.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093caf71cb6b---2639031834.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/6de3b9d9ba88d0b9e2f48d5c3bdf2b9a/79404758249.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/13f73714598900f31ac77c4d244b3350/tezolure.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/38072521857.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/60402804622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=30+day+watercolor+challengePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C3 10784 bytes
SHA-256: eec1c4247bb4666ca0d0ce3382859bbc968cff850550da1e88f1dcdda5392a95
font_01_sfnt_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 17096 bytes
SHA-256: 6183f5f0d6435dd2594d1122845f777a16dc85219ad1246a1ea61b8b5b54ed7c
font_02_sfnt_off00012555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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